.calendar {
    position: relative;
    width: 36px;
    height: 5px;
    margin: 2px 5px 30px;
    background-color: #ccc;
    border-radius: 2px 2px 0 0;
    transform-style: preserve-3d;
    color: rgb(233, 233, 233);
    font-size: 20px;
    font-weight: 200;
    line-height: 40px;
    text-align: center;
    transform: translateZ(0);
}
.calendar::before,
.calendar::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 5px;
    z-index: -1;
    display: block;
    width: 40px;
    height: 30px;
    background-color: aqua;
    border-radius: 3px;
    margin-left: -20px;
}
.calendar::before {
    background-color: rgb(35, 109, 193);
    transform: translateZ(-2px) rotateX(-10deg);
}
.calendar::after {
    background-color: rgb(45, 118, 228);
    transform: translateZ(-2px) rotateX(10deg);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
}